Unsworth sued Musk in September 2018, two months after playing a leading role in the rescue of 12 boys and their soccer coach from the Tham Luang Nang Non cave.
Elon Musk arrives for defamation trial over 'pedo guy' tweet
Jury selection began in a Los Angeles federal courtroom to decide whether Musk owes Vernon Unsworth punitive and other damages for harming his reputation by calling him "pedo guy."